Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc855475d529a95…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 23:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a61284a5e2ca0f6191d8cdf6d1950cda SHA-1: b96f99b9d9643736cf5d54ff7c1466658ec0679d SHA-256: ecc855475d529a9515c23e50ee06c4f8fb11918db5f971b6790868c0392cfa09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a high ML score combined with ClamAV detection indicates malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/award?keyword=advantages+and+disadvantages+of+non+aqueous+titration+pdf PDF link annotation
    • https://cdn.sqhk.co/kekotenonaxu/begejd5/special_forces_group_2_apk_mod.pdfIn PDF document text
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/vofuzufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_6017d475c1d37.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/67892427893.pdfIn PDF document text
    • https://fotekexilinita.weebly.com/uploads/1/3/4/2/134235887/6658432.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/7629076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_601b9586ef26f.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/aptitude_questions_and_answers_for_freshers.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/74214746178.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/1486279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff23881ab01a.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/siwumozikezidididun.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/jhdeghZ/best_islamic_quotes_in_urdu_2019.pdfIn PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/xetuw-sijisuvuk-birobusenizi-pulexu.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/Gu0yhhn/box_car_racing_games_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/komaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c77c94-d5a1-4b53-8b7b-020667aecf71/95403555935.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/69570578680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f07b19-0004-4ee8-abd8-6701c2ab2cd3/how_long_is_the_warranty_on_a_rheem_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/g10_fibreglass_sheet_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc0665a-2c01-4ee2-98ea-45a87b72f412/93338758866.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 5352 bytes
SHA-256: 544083d448df343b3a2b711910a088d7599d916176912e2076cd3ebb7c9cc6e3
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 10980 bytes
SHA-256: 7169dd9d5cbf32a69b1ad84d32accbb6baafb689cea9bd992605302dea190d38

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